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首页> 外文期刊>Green Chemistry Letters and Reviews >The use of nano supported nickel catalyst in reduction of p-nitrophenol using hydrazine as hydrogen donor
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The use of nano supported nickel catalyst in reduction of p-nitrophenol using hydrazine as hydrogen donor

机译：纳米负载镍催化剂在肼为氢供体的还原对硝基苯酚中的应用

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p-Aminophenol was prepared by hydrogenation of p-nitro phenol over nano-sized nickel catalysts supported on two different supports, SiO2 and Al2O3. Hydrazine hydrate was used as hydrogen source in this reaction. Several loadings of nano-sized Ni were used, thus 20, 5, and 2.5 wt% were prepared. X-ray diffraction (XRD) and electron spin resonance (ESR) were employed to investigate the prepared catalysts. The Ni/Al2O3 was found to be more effective and give high durability. The catalytic activity of the reaction was found to be influenced by both the crystallinity of the nickel and the strain among nano-sized nickel particles. The prepared catalysts showed higher catalytic activity, especially at lower loading. During the reaction, a detectable change of the color was observed from yellow to green and finally to colorless, which enable us to suppose a mechanism of this reaction.
机译：对氨基苯酚是通过在两种不同载体SiO2和Al2O3上负载的纳米尺寸镍催化剂上对硝基苯酚的加氢制备的。在该反应中使用水合肼作为氢源。使用了几种负载的纳米尺寸的Ni，因此制备了20、5和2.5 wt％。利用X射线衍射（XRD）和电子自旋共振（ESR）研究了制备的催化剂。发现Ni / Al 2 O 3更有效并且具有高耐久性。发现反应的催化活性受镍的结晶度和纳米级镍颗粒之间的应变的影响。制备的催化剂显示出较高的催化活性，尤其是在较低的负载下。在反应过程中，观察到从黄色到绿色，最后到无色的可检测到的颜色变化，这使我们可以推测该反应的机理。

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